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Vulnerabilities

Vulnerability · CVE-2025-6599

An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perfor…

Published Nov 18, 2025 · catalog updated Oct 18, 2026 · lte3301-plus firmware

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-6599. EPSS is 0.34%. Act only if a listed version of lte3301-plus firmware is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Advisory link
Affected products
cpe zyxel/dm4200-b0 firmware · cpe zyxel/dx3300-t0 firmware · cpe zyxel/lte3301-plus firmware · cpe zyxel/nebula fwa505 firmware · cpe zyxel/nebula fwa510 firmware · cpe zyxel/nebula fwa515 firmware

An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests and partially disrupt access to the web management interface, while other networking services remain unaffected.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe zyxel/dm4200-b0 firmwareversion unspecified
  • cpe zyxel/dx3300-t0 firmwareversion unspecified
  • cpe zyxel/lte3301-plus firmwareversion unspecified
  • cpe zyxel/nebula fwa505 firmwareversion unspecified
  • cpe zyxel/nebula fwa510 firmwareversion unspecified
  • cpe zyxel/nebula fwa515 firmwareversion unspecified
  • cpe zyxel/nebula fwa710 firmwareversion unspecified
  • cpe zyxel/nr5103 firmwareversion unspecified
  • cpe zyxel/nr5103e firmwareversion unspecified
  • cpe zyxel/nr5309 firmwareversion unspecified
  • cpe zyxel/nr7302 firmwareversion unspecified
  • cpe zyxel/nr7303 firmwareversion unspecified

How to fix CVE-2025-6599

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-6599. EPSS is 0.34%. Act only if a listed version of lte3301-plus firmware is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 18, 2025 · NIST NVD

    Detected

    An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests and partially disrupt access to the web management interface, while other networking services remain unaffected.

  2. Oct 18, 2026 · NIST NVD

    Updated

    An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests and partially disrupt access to the web management interface, while other networking services remain unaffected.

Sources

  • CVE.orgVulnerability recordCVE-2025-6599

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-6599

    30-day exploitation probability 0.34%

    first.org
  • NIST NVDVulnerability recordCVE-2025-6599

    An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests an

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • NIST NVDOct 18, 2026